Changes in resident mix in nursing homes: cognitive and sensory data from a (redesigned) sampling plan.

In planning and implementing a study, we unintentionally and serendipitously obtained data about changes in resident mix over a 2.8-yr. period. We screened residents of a 184-bed nursing home for cognition and sensorium in October 1984 to assess sampling feasibility for a grant proposal in preparation. At that time, 65.2% of the residents met the sampling criteria. However, in July/August 1987, after award of funding, only 5.4% of residents of the same nursing home met the cognitive and sensory criteria. We were forced to recruit from an additional six nursing homes, in which only 9.3% of residents met the sampling criteria.